KIA Niro: Pressure Source Unit Repair procedures

Pressure Source Unit Components and components location

Warning

Warning

PSU (Presser Source Unit) must not be disassembled.

  1. Pressure Source Unit (PSU)
  2. Pressure Source Unit (PSU) connector
  3. Motor
  4. Filler adapter
  5. Bracket
  6. Accumulator

Removal

Warning

The following section describes how to diagnose faults using a diagnostic instrument.

1) Connect self-diagnosis connector (16pins) located under the driver side crash pad to self-diagnosis device, and then turn the self-diagnosis device after key is ON.

2) Select the "vehicle model" and "ESC/AHB" on KDS vehicle selection screen.

3) Select the "High Pressure Release Mode" on KDS screen, then select OK.

4) Proceed with the test according to the screen instructions.

  1. Turn ignition switch OFF and disconnect the negative (-) battery terminal.
  2. Remove the air cleaner assembly.

    (Refer to Engine Mechanical System - "Air Cleaner")

  3. Remove the brake fluid from the master cylinder reservoir with a syringe.

Warning

Do not spill brake fluid on the vehicle as it may damage the paint. If brake fluid comes in contact with the paint, wash off immediately with water.

  1. Remove the connector and wire ring bracket.

  1. Loosen the pressure source unit (PSU) flare nut (A) and then remove the tube.

Tightening torque: 12.7 - 16.7 N*m (1.3 - 1.7 kgf*m, 9.4 - 12.3 lb*ft)

  1. Disconnect the pressure source unit (PSU) connector (A) and hose (B).

  1. Remove the sub frame.

    (Refer to Suspension System - "Sub Frame")

  2. Loosen the nuts and bolt and then remove the pressure source (PSU).

Tightening torque: 19.6 - 29.4 N*m (2.0 - 3.0 kgf*m, 14.5 - 21.7 lb*ft)

Installation

Installation

  1. Installation is the reverse of removal.
  2. Check the brake pedal operation.
  3. After filling the brake fluid in the reservoir, perform the air bleed.

    (Refer to the Brake system - "Brake Bleeding Procedure")

  4. Conduct the pedal traval sensor (PTS) calibration.

    (Refer to the Brake System - "Brake Pedal")

  5. Conduct the pressure sensor calibration.

Diagnostic Procedure Using a Diagnostic Instrument

The following section describes how to diagnose faults using a diagnostic instrument.

  1. Connect self-diagnosis connector (16pins) located under the driver side crash pad to self
  2. Select the "vehicle model" and "ESC/AHB" on KDS vehicle selection screen.
  3. Proceed with the test according to the screen instructions.

Pressure Sensor Calibration

Pedal Travel Sensor (PTS) Calibration

Pedal Travel Sensor (PTS) Calibration

Brake Line

    READ NEXT:

     Brake Line

    Brake Line Components and components location Removal Disconnect the brake fluid level switch connector, and remove the reservoir cap. Remove the brake fluid from the master cylinder reservoir with a syringe. Warning Do not spill

     Brake Pedal

    Brake pedal member assembly Stop lamp switch Brake pedal arm Brake pedal pad Brake pedal stroke sensor Removal Turn ignition switch OFF and disconnect the negative (-) battery terminal. Remove the crash pad lower panel. (

     Front Disc Brake

    Front Disc Brake Components and components location Bleed screw Caliper body Pad inner shim Brake pad Pad return spring Caliper carrier Pad retainer Removal Remove the wheel & tire. Remove the caliper hose bracket bol

    SEE MORE:

     Good driving practices

    Never change the gear from P (Park) or N (Neutral) to any other position with the accelerator pedal depressed. Never change the gear into P (Park) when the vehicle is moving. Stop the vehicle completely before changing the gear into R

     Seat warmer/ventilation

    The seat warmer/ventilation is provided to warm/cool the front and the rear seats. * The seat ventilation is provided only on the front seats. Operation Push the button to control the function. It defaults to the OFF position the veh